Shaking, nausea and almost loss of consciousness after wide spread poison ivy rash even days after initial exposure. is that something to be worried?

Yes, Doc ASAP: Severe and widespread poison ivy reactions may be nearly as bad as having a 3rd degree burn making you susceptible to infection. You need to be properly hydrated and treated. See a doctor ASAP. Be sure that all items potentially exposed be cleaned with a laundry detergent (wear glove if you are doing it) to avoid further exposure to the resin.